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Business segment data (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Business segment data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
External operating revenues | $ 1,184,423,000 |  | $ 1,285,782,000 | $ 1,060,595,000 | $ 931,604,000 | $ 1,081,144,000 |  | $ 1,173,518,000 | $ 967,962,000 | $ 852,807,000 | $ 4,462,404,000 |  | $ 4,075,431,000 |  | $ 4,050,492,000 |
Intersegment operating revenues |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  |  | 386,856,000 |  | 359,205,000 |  | 343,395,000 |
Interest expense |  |  |  |  |  |  |  |  |  |  | 83,917,000 |  | 76,699,000 |  | 81,354,000 |
Income taxes |  |  |  |  |  |  |  |  |  |  | 136,736,000 |  | (31,146,000) |  | 110,274,000 |
Earnings (loss) on common stock before income (loss) from discontinued operations |  |  |  |  |  |  |  |  |  |  | 278,560,000 |  | (15,006,000) |  | 225,267,000 |
Income (loss) from discontinued operations, net of tax | (58,000) |  | (118,000) | (59,000) | (77,000) | 8,700,000 |  | (139,000) | 5,106,000 | (100,000) | (312,000) | [1] | 13,567,000 | [1] | (12,926,000) | [1]
Total earnings (loss) on common stock |  |  |  |  |  |  |  |  |  |  | 278,248,000 |  | (1,439,000) |  | 212,341,000 |
Net proceeds from sale or disposition of property and other |  |  |  |  |  |  |  |  |  |  | (112,131,000) |  | (57,460,000) |  | (40,857,000) |
Total net capital expenditures |  |  |  |  |  |  |  |  |  |  | 728,070,000 |  | 933,777,000 |  | 481,023,000 |
Total assets | 7,061,332,000 |  |  |  |  | 6,682,491,000 |  |  |  |  | 7,061,332,000 |  | 6,682,491,000 |  | 6,556,125,000 |
Property, plant and equipment | 8,803,866,000 |  |  |  |  | 8,107,751,000 |  |  |  |  | 8,803,866,000 |  | 8,107,751,000 |  |  |
Less accumulated depreciation, depletion and amortization | 3,872,487,000 |  |  |  |  | 3,608,912,000 |  |  |  |  | 3,872,487,000 |  | 3,608,912,000 |  | 3,361,208,000 |
Net property, plant and equipment | 4,931,379,000 |  |  |  |  | 4,498,839,000 |  |  |  |  | 4,931,379,000 |  | 4,498,839,000 |  | 4,285,014,000 |
Additional information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write-downs of oil and natural gas properties |  |  |  |  |  | 231,700,000 |  | 160,100,000 |  |  | 0 |  | 391,800,000 |  | 0 |
Noncash write-down of natural gas and oil properties, after tax |  |  |  |  |  | 145,900,000 |  | 100,900,000 |  |  |  |  | 246,800,000 |  |  |
Asset impairment charges |  |  |  | 9,000,000 |  |  |  |  | 1,700,000 |  | 9,000,000 |  | 1,700,000 |  |  |
Reversal of an arbitration charge after tax | 1,500,000 |  |  |  |  | 13,000,000 |  |  | 15,000,000 |  | 1,500,000 |  | 15,000,000 |  |  |
Net noncash inclusion of acct pay and NCI exclusion of capital expenditures |  |  |  |  |  |  |  |  |  |  | (56,800,000) |  | 33,700,000 |  | 24,000,000 |
Regulated: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business segment data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
External operating revenues |  |  |  |  |  |  |  |  |  |  | 1,264,574,000 |  | 1,131,626,000 |  | 1,343,714,000 |
Nonregulated: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business segment data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
External operating revenues |  |  |  |  |  |  |  |  |  |  | 3,197,830,000 |  | 2,943,805,000 |  | 2,706,778,000 |
Electric: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business segment data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
External operating revenues |  |  |  |  |  |  |  |  |  |  | 257,260,000 |  | 236,895,000 |  | 225,468,000 |
Intersegment operating revenues |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  |  | 32,789,000 |  | 32,509,000 |  | 32,177,000 |
Interest expense |  |  |  |  |  |  |  |  |  |  | 12,590,000 |  | 12,421,000 |  | 13,745,000 |
Income taxes |  |  |  |  |  |  |  |  |  |  | 9,683,000 |  | 8,975,000 |  | 7,242,000 |
Earnings (loss) on common stock before income (loss) from discontinued operations |  |  |  |  |  |  |  |  |  |  | 34,837,000 |  | 30,634,000 |  | 29,258,000 |
Capital expenditures |  |  |  |  |  |  |  |  |  |  | 168,557,000 |  | 112,035,000 |  | 52,072,000 |
Total assets | 884,283,000 | [2] |  |  |  | 760,324,000 | [2] |  |  |  | 884,283,000 | [2] | 760,324,000 | [2] | 672,940,000 | [2]
Property, plant and equipment | 1,315,822,000 | [2] |  |  |  | 1,150,584,000 | [2] |  |  |  | 1,315,822,000 | [2] | 1,150,584,000 | [2] | 1,068,524,000 | [2]
Natural gas distribution: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business segment data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
External operating revenues |  |  |  |  |  |  |  |  |  |  | 851,945,000 |  | 754,848,000 |  | 907,400,000 |
Intersegment operating revenues |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  |  | 50,031,000 |  | 45,731,000 |  | 44,641,000 |
Interest expense |  |  |  |  |  |  |  |  |  |  | 25,123,000 |  | 28,726,000 |  | 29,444,000 |
Income taxes |  |  |  |  |  |  |  |  |  |  | 16,633,000 |  | 12,005,000 |  | 16,931,000 |
Earnings (loss) on common stock before income (loss) from discontinued operations |  |  |  |  |  |  |  |  |  |  | 37,656,000 |  | 29,409,000 |  | 38,398,000 |
Capital expenditures |  |  |  |  |  |  |  |  |  |  | 101,279,000 |  | 130,178,000 |  | 70,624,000 |
Total assets | 1,786,068,000 | [2] |  |  |  | 1,703,459,000 | [2] |  |  |  | 1,786,068,000 | [2] | 1,703,459,000 | [2] | 1,679,091,000 | [2]
Property, plant and equipment | 1,776,901,000 | [2] |  |  |  | 1,689,950,000 | [2] |  |  |  | 1,776,901,000 | [2] | 1,689,950,000 | [2] | 1,568,866,000 | [2]
Pipeline and energy services: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business segment data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
External operating revenues |  |  |  |  |  |  |  |  |  |  | 155,369,000 |  | 139,883,000 |  | 210,846,000 |
Intersegment operating revenues |  |  |  |  |  |  |  |  |  |  | 46,699,000 |  | 53,274,000 |  | 67,497,000 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  |  | 29,119,000 |  | 27,684,000 |  | 25,502,000 |
Interest expense |  |  |  |  |  |  |  |  |  |  | 10,330,000 |  | 7,742,000 |  | 10,516,000 |
Income taxes |  |  |  |  |  |  |  |  |  |  | 3,390,000 |  | 15,291,000 |  | 12,912,000 |
Earnings (loss) on common stock before income (loss) from discontinued operations |  |  |  |  |  |  |  |  |  |  | 7,629,000 |  | 26,588,000 |  | 23,082,000 |
Capital expenditures |  |  |  |  |  |  |  |  |  |  | 127,092,000 |  | 133,787,000 |  | 45,556,000 |
Total assets | 798,701,000 |  |  |  |  | 622,470,000 |  |  |  |  | 798,701,000 |  | 622,470,000 |  | 526,797,000 |
Property, plant and equipment | 962,172,000 |  |  |  |  | 816,533,000 |  |  |  |  | 962,172,000 |  | 816,533,000 |  | 719,291,000 |
Exploration and production: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business segment data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
External operating revenues |  |  |  |  |  |  |  |  |  |  | 490,924,000 |  | 412,651,000 |  | 359,873,000 |
Intersegment operating revenues |  |  |  |  |  |  |  |  |  |  | 45,099,000 |  | 35,966,000 |  | 93,713,000 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  |  | 186,458,000 |  | 160,681,000 |  | 142,645,000 |
Interest expense |  |  |  |  |  |  |  |  |  |  | 14,315,000 |  | 9,018,000 |  | 7,445,000 |
Income taxes |  |  |  |  |  |  |  |  |  |  | 53,197,000 |  | (108,264,000) |  | 46,298,000 |
Earnings (loss) on common stock before income (loss) from discontinued operations |  |  |  |  |  |  |  |  |  |  | 94,450,000 |  | (177,283,000) |  | 80,282,000 |
Capital expenditures |  |  |  |  |  |  |  |  |  |  | 391,315,000 |  | 554,528,000 |  | 272,855,000 |
Total assets | 1,616,131,000 |  |  |  |  | 1,539,017,000 |  |  |  |  | 1,616,131,000 |  | 1,539,017,000 |  | 1,481,556,000 |
Property, plant and equipment | 3,060,848,000 |  |  |  |  | 2,764,560,000 |  |  |  |  | 3,060,848,000 |  | 2,764,560,000 |  | 2,615,146,000 |
Construction materials and contracting: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business segment data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
External operating revenues |  |  |  |  |  |  |  |  |  |  | 1,675,444,000 |  | 1,597,257,000 |  | 1,509,538,000 |
Intersegment operating revenues |  |  |  |  |  |  |  |  |  |  | 36,693,000 |  | 20,168,000 |  | 472,000 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  |  | 74,470,000 |  | 79,527,000 |  | 85,459,000 |
Interest expense |  |  |  |  |  |  |  |  |  |  | 17,394,000 |  | 15,211,000 |  | 16,241,000 |
Income taxes |  |  |  |  |  |  |  |  |  |  | 24,765,000 |  | 14,099,000 |  | 11,227,000 |
Earnings (loss) on common stock before income (loss) from discontinued operations |  |  |  |  |  |  |  |  |  |  | 50,946,000 |  | 32,420,000 |  | 26,430,000 |
Capital expenditures |  |  |  |  |  |  |  |  |  |  | 34,607,000 |  | 45,083,000 |  | 52,303,000 |
Total assets | 1,305,808,000 |  |  |  |  | 1,371,252,000 |  |  |  |  | 1,305,808,000 |  | 1,371,252,000 |  | 1,374,026,000 |
Property, plant and equipment | 1,510,355,000 |  |  |  |  | 1,504,981,000 |  |  |  |  | 1,510,355,000 |  | 1,504,981,000 |  | 1,499,852,000 |
Construction services: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business segment data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
External operating revenues |  |  |  |  |  |  |  |  |  |  | 1,029,909,000 |  | 932,013,000 |  | 834,918,000 |
Intersegment operating revenues |  |  |  |  |  |  |  |  |  |  | 9,930,000 |  | 6,545,000 |  | 19,471,000 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  |  | 11,939,000 |  | 11,063,000 |  | 11,399,000 |
Interest expense |  |  |  |  |  |  |  |  |  |  | 4,306,000 |  | 4,435,000 |  | 4,473,000 |
Income taxes |  |  |  |  |  |  |  |  |  |  | 29,504,000 |  | 24,128,000 |  | 13,426,000 |
Earnings (loss) on common stock before income (loss) from discontinued operations |  |  |  |  |  |  |  |  |  |  | 52,213,000 |  | 38,429,000 |  | 21,627,000 |
Capital expenditures |  |  |  |  |  |  |  |  |  |  | 15,102,000 |  | 14,835,000 |  | 9,711,000 |
Total assets | 450,614,000 |  |  |  |  | 429,547,000 |  |  |  |  | 450,614,000 |  | 429,547,000 |  | 418,519,000 |
Property, plant and equipment | 134,948,000 |  |  |  |  | 130,624,000 |  |  |  |  | 134,948,000 |  | 130,624,000 |  | 124,796,000 |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business segment data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
External operating revenues |  |  |  |  |  |  |  |  |  |  | 1,553,000 |  | 1,884,000 |  | 2,449,000 |
Intersegment operating revenues |  |  |  |  |  |  |  |  |  |  | 8,067,000 |  | 8,486,000 |  | 8,997,000 |
Depreciation, depletion and amortization |  |  |  |  |  |  |  |  |  |  | 2,050,000 |  | 2,010,000 |  | 1,572,000 |
Interest expense |  |  |  |  |  |  |  |  |  |  | 15,000 |  | 13,000 |  | 0 |
Income taxes |  |  |  |  |  |  |  |  |  |  | 2,433,000 |  | 2,620,000 |  | 2,238,000 |
Earnings (loss) on common stock before income (loss) from discontinued operations |  |  |  |  |  |  |  |  |  |  | 5,136,000 |  | 4,797,000 |  | 6,190,000 |
Capital expenditures |  |  |  |  |  |  |  |  |  |  | 2,249,000 |  | 791,000 |  | 18,759,000 |
Total assets | 219,727,000 | [3] |  |  |  | 256,422,000 | [3] |  |  |  | 219,727,000 | [3] | 256,422,000 | [3] | 403,196,000 | [3]
Property, plant and equipment | 49,997,000 |  |  |  |  | 50,519,000 |  |  |  |  | 49,997,000 |  | 50,519,000 |  | 49,747,000 |
Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business segment data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intersegment operating revenues |  |  |  |  |  |  |  |  |  |  | (146,488,000) |  | (124,439,000) |  | (190,150,000) |
Interest expense |  |  |  |  |  |  |  |  |  |  | (156,000) |  | (867,000) |  | (510,000) |
Income taxes |  |  |  |  |  |  |  |  |  |  | (2,869,000) |  | 0 |  | 0 |
Earnings (loss) on common stock before income (loss) from discontinued operations |  |  |  |  |  |  |  |  |  |  | (4,307,000) |  | 0 |  | 0 |
Property, plant and equipment | $ (7,177,000) |  |  |  |  | $ 0 |  |  |  |  | $ (7,177,000) |  | $ 0 |  | $ 0 |
[1] | Reflected in the Other category.
[2] | Includes allocations of common utility property.
[3] | Includes assets not directly assignable to a business (i.e. cash and cash equivalents, certain accounts receivable, certain investments and other miscellaneous current and deferred assets).

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